Scientific Method

If the parameters are not controlled in a scientific experiment, then one cannot be sure what the variables are. Unless you conduct the experiment in a closed environment with only only one variable, one's results can be confusing and inconclusive.

Burning a candle is an irreversible change because the wax undergoes a chemical reaction with the oxygen in the air, producing new substances like carbon dioxide, water vapor, and ash. Once the candle has been burned, it cannot be restored to its original state.

That simply means that the lid will reduce the heat transfer.

The next step in the scientific method after forming a hypothesis is to design and conduct experiments to test the hypothesis. This involves collecting data, analyzing results, and drawing conclusions based on the evidence gathered.

Molecules in a substance slow down when a substance is cooled.

Temperature is the measure of average kinetic energy of particles.

Kinetic energy is the energy of motion.

So when temperature decreases, the average kinetic energy decreases, so the energy of motion decreases, and the molecule slows down.

The size of the container or vessel used for the solute and solvent would likely not affect the rate of solubility, as long as there is sufficient space for mixing.

The most acceptable method for obtaining the accurate weight of a specimen in a laboratory experiment is to use a calibrated analytical balance or scale. Place the specimen gently on the balance pan, allow it to stabilize, and record the weight displayed on the balance. Ensure the balance is calibrated, zeroed, and that the specimen is handled properly to avoid errors.

It depends on the specific method you are referring to. Some methods can be used for gases, while others are designed for liquids or solids. It's important to check the applicability of the method to gases before use.

To calculate power, you can use the formula: Power = Work / Time. In this case, the work done is 425 J and the time taken is 10.5 seconds. Plugging these values into the formula, the power expended by the boy to pull the sled up the hill is 40.48 watts.

There is no specific individual known as Lord Saint Helens. However, Mount St. Helens is an active volcano located in Washington State, USA. It is famous for its catastrophic eruption in 1980 that caused significant destruction and loss of life.

There are 3 significant figures in 0.0000246 g.

Your teacher does not want to hear the hypothesis from some random person on the internet. The idea is for you to form your own hypothesis - just put down what you guessed would happen and be honest about it instead of trying to cheat.

The speed of the vibration changes the pitch of a sound. A higher speed of vibration creates a higher pitch, while a lower speed of vibration creates a lower pitch. The size of the vibration does not directly affect the pitch, but it can influence the volume or intensity of the sound.

To make a simple electric motor, you will need a battery, copper wire, a magnet, and a base to hold the motor. By winding the copper wire around the base and connecting it to the battery, you create an electromagnet. When the base is placed between the poles of the magnet, the electromagnet will interact with the magnetic field to spin the motor. This simple motor demonstrates how electrical energy can be converted into mechanical motion.

A long-handled spoon is better for stirring boiling water as it allows you to keep your hand at a safe distance from the heat. Additionally, a heat-resistant material like stainless steel or silicone is recommended to prevent the spoon from melting or warping in the hot water.

The dropping of an atomic bomb on Hiroshima is a historical event, not a scientific experiment that can be replicated or tested. While scientific methods can be used to study the aftermath and effects of the bomb, the actual event itself cannot be scientifically proven in the same way as a hypothesis in a controlled experiment.

The proper order of steps when using a 3-compartment dishwashing sink is:

1. Pre-wash or scrape dishes to remove food debris.
2. Wash dishes in the first sink with hot, soapy water.
3. Rinse dishes in the second sink with clean water.
4. Sanitize dishes in the third sink with a sanitizing solution.

If scientists cannot duplicate a method and prove it, it could indicate that the original results may have been an anomaly or that there are limitations or errors in the method itself. This highlights the importance of reproducibility in scientific research to ensure the accuracy and reliability of findings. Scientists may need to re-evaluate the method, seek alternative explanations, or collaborate with other researchers to verify the results.

The process of pancake batter changing into a pancake is a chemical change. This is because the ingredients in the batter undergo a chemical reaction when exposed to heat, leading to the formation of new compounds with different properties.

216.2 °C

After stating a hypothesis, a physicist is likely to design and conduct experiments or tests to gather data and evidence that either support or refute the hypothesis. This process helps to refine and validate the hypothesis through empirical observation and analysis.

The merit of a new scientific theory is judged by the scientific community based on its ability to explain existing data, make testable predictions, and withstand rigorous scrutiny through peer review and replication of results. The theory's coherence, explanatory power, and ability to advance our understanding of the natural world are also important factors in determining its acceptance within the scientific community.

You should place the stopper in a safe location away from the experiment in a well-ventilated area to prevent exposure to the acid fumes. It's important to handle the stopper with proper protective equipment if it has come into contact with the acid to avoid any potential hazards.

No, polluted water does not necessarily evaporate faster than fresh water. The rate of evaporation is primarily determined by factors such as temperature, humidity, and surface area exposed to air. Pollutants in the water may affect the evaporation rate depending on their properties, but fresh water and polluted water can evaporate at similar rates under similar conditions.